<template>
  <el-dialog width="500px" title="员工导入" :visible="showExcelDialog" @close="$emit('update:showExcelDialog', false)">
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="handleUpload"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="downloadExcel">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="uploadExcel">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import { downloadEmployeeTemplate, uploadEmployee } from '@/api/employee'
import FileSaver from 'file-saver'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    // 下载模板
    async downloadExcel() {
      const res = await downloadEmployeeTemplate()
      FileSaver.saveAs(res, '员工列表模板.xlsx')
    },
    // 上传文件的按钮
    uploadExcel() {
      // 点击后触发input的click时间
      this.$refs['excel-upload-input'].click()
    },
    // 上传文件
    async handleUpload(e) {
      // 1. 获取文件
      const files = e.target.files
      // 2. 判断文件是否为空
      if (files.length === 0) return
      // 3. 生成接口所需的数据格式 form-data
      // 文件上传 - 图片 / 音频 / excel / 视频 ... 需要使用form-data
      // 3.1 生成一个FormData对象
      const fd = new FormData()
      // 3.2 将文件添加到对象中，使用append（）方法
      fd.append('file', files[0])
      try {
        // 4. 调用接口，传入新建的对象
        const res = await uploadEmployee(fd)
        console.log(files, res)
        // 5. 重新加载数据 - 通知父组件更新数据
        this.$emit('updateList')
        // 6. 关闭弹层
        this.$emit('update:showExcelDialog', false)
        // 7. 上传成功提示用户
        this.$message.success('导入成功')
      } finally {
        // 8. 无论成功还是失败都会执行finally，清空文件选择器
        this.$refs['excel-upload-input'].value = ''
      }
    }
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
  margin: 20px;
  width: 360px;
  height: 180px;
  align-items: center;
  color: #697086;

  .excel-upload-input {
    display: none;
    z-index: -9999;
  }

  .btn-upload,
  .drop {
    border: 1px dashed #dcdfe6;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 160px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .drop {
    line-height: 40px;
    color: #bbb;

    i {
      font-size: 60px;
      display: block;
      color: #c0c4cc;
    }
  }
}
</style>
